Hwy doesn't len(None) return zero ?

[Emile van Sebille]

On 6/30/2010 11:39 AM Stef Mientki said...
>   hello,
>
> I've lot of functions that returns their result in some kind of tuple / list / array,
> and if there is no result, these functions return None.
> Now I'm often what to do something if I've more than 1 element in the result.
> So I test:

which works fine if beforehand you do

Result = presumedFuncCall() or []

particularly if you want to test len subsequently.

Emile


>
>     if len ( Result )>  1 :
>
> But to prevent exceptions, i've to write ( I often forget)
>      if Result and ( len ( Result )>  1 ) :
>
> So I wonder why len is not allowed on None
> and if there are objections to extend the len function .
>
> thanks,
> Stef Mientki
>
>